import asyncio
import aiohttp
from aiohttp import web
import string
import os
import random
import subprocess
from aiohttp.web import Response, FileResponse

app = web.Application()
app.router._frozen = False

def get_random_string(length):
    # choose from all lowercase letter
    letters = string.ascii_lowercase
    result_str = "".join(random.choice(letters) for i in range(length))
    return result_str

async def run_command(cmd):
    # Create subprocess
    process = await asyncio.create_subprocess_shell(
        cmd,
        stdout=asyncio.subprocess.PIPE,
    )
    # Wait for the subprocess to finish
    stdout, stderr = await process.communicate()
    # Check for errors
    if process.returncode!= 0:
    # Log or handle the error
        print(f"Command '{args}' failed with return code {process.returncode}")
        return None
    # Decode stdout and return
    return stdout

async def merge(request):
        # register params
    job_id = request.rel_url.query["id"]
    video_id: str = request.rel_url.query["id"]
    audio_itag: str = request.rel_url.query["audio_itag"]
    video_itag: str = request.rel_url.query["video_itag"]
    # validate
    if " " in video_id or len(video_id) > 11:
        print(f"Video {video_id} flagged as invalid, dropping request")
        return
    if not audio_itag.isdigit():
        print(f"Audio itag {audio_itag} flagged as invalid, dropping request")
        return
    if not video_itag.isdigit():
        print(f"Video itag {video_itag} flagged as invalid, dropping request")
        return
    if os.path.isfile(f"{job_id}.mp4"):
        return web.FileResponse(
                path=f"{job_id}.mp4"
        )
    cmdline = f"ffmpeg -i \"https://eu-proxy.poketube.fun/latest_version?id={video_id}&itag={audio_itag}&local=true\" -i \"https://eu-proxy.poketube.fun/latest_version?id={video_id}&itag={video_itag}&local=true\" -c copy -f mp4 -movflags frag_keyframe+empty_moov -"
    #proc_ffmpeg = await asyncio.create_subprocess_shell(
    #       cmdline,
    #       stdout=asyncio.subprocess.PIPE
    #)
    #print(f"ffmpeg -i \"https://eu-proxy.poketube.fun/latest_version?id={video_id}&itag={audio_itag}&local=true\" -i \"https://eu-proxy.poketube.fun/latest_version?id={video_id}&itag={video_itag}&local=true\" -c copy -f mp4 -movflags frag_keyframe+empty_moov -")
    #stdout, _ = await proc_ffmpeg.communicate()
    #iwannakillmyself = await run_command(cmdline)
    process = await asyncio.create_subprocess_shell(
        cmdline,
        stdout=asyncio.subprocess.PIPE,
    )
    # Wait for the subprocess to finish
    #stdout, stderr = await process.communicate()
    response = web.StreamResponse(status=200, reason='OK', headers={
        'Content-Type': 'video/mp4',
        'Transfer-Encoding': 'chunked',
    })
    await response.prepare(request)
    try:
        while True:
            # Read data from stdout
            chunk = await process.stdout.readline()
            if not chunk:
                break
            # Write the chunk to the response
            await response.write(chunk)
    except Exception as e:
        print(f"Error streaming FFmpeg output: {e}")
    finally:
        # Close the response
        await response.write_eof()
        return response
    # Check for errors
    #if process.returncode != 0:                                                                                # Log or handle the error
        #print(f"Command '{args}' failed with return code {process.returncode}")
        #return None
    # Decode stdout and return                                                                                return stdout
    #response = Response(body=stdout, content_type="video/mp4", headers="")
    #return response

async def ping(request):
    return web.Response(body='{"success": true}', content_type="application/json")

async def init_app():
    app.router.add_get("/{id:.+}", merge)
    app.router.add_get("/", ping)
    return app

if __name__ == '__main__':
    loop = asyncio.get_event_loop()
    app = loop.run_until_complete(init_app())
    web.run_app(app, port=3030)